Photovoltaic Systems Engineering - Ali...

Ali Karimpour & Reza Bakhshi 2016

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Photovoltaic systems engineering

Photovoltaic Systems

Engineering

Ali Karimpour

Associate Professor

Ferdowsi University of Mashhad

Reza Bakhshi

Ph.D. candidate

Ferdowsi University of Mashhad


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Lecture 10

Preventive maintenance


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Preventive maintenance (PM)

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What is Preventive maintenance (PM)?

Preventative maintenance (or preventive maintenance) is maintenance that

is regularly performed on a piece of equipment to lessen the likelihood of its

failing. Preventative maintenance is performed while the equipment is still

working, so that it does not break down unexpectedly.

There are different types of maintenance. Among all, two of them are greatly

important:

Corrective Maintenance: Required to repair damage or replace failed

components. The example of corrective maintenances is inverter resets.


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Preventive maintenance (PM)

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When PM should de done?

Scheduling and frequency of preventative PM is influenced by a number of

factors, such as equipment type, environmental conditions (snow, pollen,

humidity, dust, wildlife, etc.) of the site, and warranty terms.

The maintenance is scheduled based on a time or usage trigger.

A typical example of an asset with a time based preventative maintenance

schedule is an air-conditioner which is serviced every year, before summer.

A typical example of an asset with a usage based preventative maintenance

schedule is a motor-vehicle which might be scheduled for service every

10,000 km.


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Preventive maintenance (PM) for solar systems

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The photovoltaic systems are expensive technology and consequently, its

optimum performance without failure is so important.

In this lecture, we try to introduce some PM protocols of grid connected PV

systems.


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PM lists for solar systems

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1. The most common maintenance task for solar modules is the

cleaning of the glass area to remove excessive dirt.


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“The dust especially in desert area and birds are the most common reason of PV

dirts”


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“The PV modules should be cleaned at least every two weeks”


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“The PV modules should be cleaned at least every two weeks”

“The PV modules accessibility is an important key that should be

considered in system structure”


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“Snow can make the PV output power zero (shutdown the system)”

“The PV modules accessibility is an important key that should be

considered in system structure”


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“Snow can make the PV output power zero (shutdown the system)”


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Remember Trombe wall project presented in Lecture 5.

The position is considered for sweeping snow and cleaning PV.


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2. PV corrosion and spot can be happened in PV panels


The back cover of PV should be opened and checked at least each year.

The appearances of spots also should be checked.


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2. PV corrosion and spot can be happened in PV panels



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3. The voltage and current of PV panels should be annually

measured.


The measured and presented voltage and current values should be consisted by

each other.


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In addition, the correct performance of PV panel can be evaluated by the

solar IV equipment.



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4. The inverter data presented in its screen can show its

correct performance.


This data can be monitored remotely by phones, mobiles, etc.


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5. The structures should be worked in all climates against

storm, corrosion, etc.



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6. Permanent shading can lessen the output power and PV

panel lifetime significantly.



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1. T.J. Keating, A. Walker and K. Ardani, “Best Practices in PV

System Operations and Maintenance”, Technical report, National

Renewable Energy Laboratory (NREL), March 2015.

2. Josh Haney and Adam Burstein, “PV System Operations and

Maintenance Fundamentals”, Technical report, Next Phase Solar

institute, August 2013.

References

Photovoltaic Systems Engineering - Ali...

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